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Configuring Voice Services
ATA Software Features
ATA Software Features
Cisco Small Business WRP400 Administration Guide
Telephone/fax
V
V
WRP400
The WRP400 maintains the state of each call it terminates and makes the proper
reaction to user input events (such as on/off hook or hook flash). The WRP400 uses
the Session Initiation Protocol (SIP) open standard, so there is little or no
involvement by a "middle-man" server or media gateway controller. SIP allows
interoperation with all ITSPs that support SIP.
The WRP400 is equipped with a full featured, fully programmable ATA that can be
custom provisioned within a wide range of configuration parameters. The
following sections describe the factors that contribute to voice quality:
•
"Supported Codecs," on page 29
•
"SIP Proxy Redundancy," on page 30
•
"Other ATA Software Features," on page 31
Supported Codecs
The WRP400 supports the following codecs:
•
G.711u (configured by default) and G.711a
G.711 (A-law and mμ-law) are very low complexity codecs that support
uncompressed 64 kbps digitized voice transmissions at one through ten 5 ms
voice frames per packet. This codec provides the highest voice quality and
uses the most bandwidth of any of the available codecs.
Ethernet
Internet
Access Device
Voice
gateway
Internet
Service Provider
V
V
V
VoIP Infrastructure
IP
SIP proxy
Phone
3
PSTN
29
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